Grinder



Fel 27, 1940. 1 .J.wAH|. f I 2,191,600 GRINDER Filed lAug. 25, 19372 2 Sheets-Sheet 1 ffy 5f J 3@ ff I I I I I I I l l f if Zfeo yewal l# @Mm ewa 1' Patented Feb.` 27, 1940 yz 'y 'fa V '2,1 91,6oo s "GRINDER Leo wahrsterlina el Application August 25,"1937,l Serial No.v'160,869 l E3 claims. (01.51;.9sn".` Thislinvenndn relates-to grinders and" is par which .a grinding yWheel H is=m0unted,.tnegr1nd ticularly directed to the" provision of a grinder ing wheel being clamped in position by a vnut I2 adapted for sharpening the blades of shear s,'s'cis which' has an annular flange I3 for pressing sors,` and thelike. against the side of the grinding wheel. IS' Onepurpose of #the invention is to provide a The casing 5 4is ymade upof three sheet meta 55.

grindingfapparatuswhich has means -for clampmembers I4, I5, and I6. The` members I4'and` I5 ing a'sh'ear'blade at an angle ,with respect to the `have vertical portions, engaging'thev member IB, grinding wheel 'whichis nonadjustable so that, heldf'togetherby a plurality of tie rods I1 and lnach Vtime the shear is sharpened, exaeuy the I8." The member I6 is substantially U-shapedas 30 same 'angle will used and no stockl on the shear shown, and is further connected to the members lui 'y ingk is all done by movingv the shearfblade in a DIaGOm 25-The-DlaIif01m 25 iS Seuredvby a 20 l V .30. 'witliout'theneeessity Of'i-,aki'ng the shearaparg f forms a detachable shoe'.. The member I5 is eX- 30 '4U In the drawings:

blade wasted." I I4 and I5 by a pair of crossbars I9:and .20 which l' This/grinding 'machine is intended for. use in are securedftol the members III,- I5,I and |61 by barbepshop-s and, similar places' Where' if, is'lnee suitablescrews such as shown .at 2|, 22, and23,v essryltosharpen a relatively small number of the screws 23 being threaded into the bars I9 and shears `at intervals, the construction-of thegrind- 20 thrOllgh the member 'l-G, 'and the Screws '2l U35 ing machine'being such as to avoid any complif 'and22 being threaded into the ends of the bars' cated control-mechanisms. 1 through the members I4 and I5. Y. The present invention contemplates thegpro-` The member. rI4 "rojects vforwardly and has a` vision' of ,agrinding apparatus in which the grind- I turned OVer flange 24 Which Supports 011e end 0f a plane which is parallel to or substantially coinscrew 2'6` to the danse Q5-The memberlE also l sides witnthe axis' of thefgrinding wheel.r vIn projects forwardand has a flange 21 Supporting other werds, it is the function of the-grinding ap-y `the platform and Secured thereto by afscrew "paratustofpresent the Work to the wheelfso that '2S- .1'

.125 the angl'e'S ofthe grinder is noteehang'ed asd-,he The member I4 extends downwardly below the 25` Wheybeycomes smaller 'from wear.' lower "edge of the member I6' and'has an elon- "Thle present invention' also' contempltesthe kgated rubberfsupportingshoe 29 y:I-ltt'ed over its provision ofa grinding apparatushaving means. lower edge.v The S1106 29 iS Simply gIOOVBd t0 re- :fo riwzlanping` and guiding the made of a shear ceive the lower edge of 'the member Asothat it Thffature's and the advantages of the invenrtendedhorizontally away from the member I6 at tion will appear more fully asthedese'ription pro- 'the lower edge thereof to form a shelf 30 rbeneath ceedsreference being had tor-fthe -raccompanying 1the. ;grlnding 'wheel I I to catch the material" drawings-.wherein ma,'prefemdJ form @f1-,he inground away inthe useiof .the wheel. Atpits 35 :vent'ion: is" Shown .It is to' be understood, howouter end, the shelf 30 is turned down, as indi- 35 ever, that the drawings anddeseiptionare iuuscatedfat 3l, and a Second shoe 32 is grooved to trative only and are not to vbeftaken asj'limiting `ISGGV'@ the DOIOH 3| The WO Sh0eS-29 and 32 the invention except in' so` far as itis limited by thus' DIOVde 2i SUDDOII" OI' th'erllie grinder. the claims. l f l v. fThe-platform 25extends beyond the flange 21 l asubstantial distance and the top ofthisLplat- 40 Fig. l is a plan view of a grinder embodying the form preferably is flat and smooth so that it may inventiom be used las ajguide forl guiding a clamp 33 for, Fig; Zvis an end view with'the platform and the clamping the shear blades in a manner which shear blade cut off to better illustrate the anguwill be presently described. vThe position of the,v 4D lar position of rthe shear blade 'being sharpened; top surface` of the platform 25 is such that it lies 45 Fig. 3.is a front View of the grinder. in a plane. extending substantially radially with' Referring now in detail to the drawings, the respect to the shaft of the grinding wheel Il. present inventionis embodied in a grinder of the The axis of the grinding wheel .is therefore in type vwherein a power driven grinding wheel is 'ze plane of the top of the platform, and if the usedmto grind the edges of vshear blades.v The work is moved in this plane against the wheel 50' grinder comprises a casing 5 which houses amo- II the diameter of the grinding wheelmay vary I tor.' Themotor 6 has a drive shaft 1 projectover a wide range without the necessityof anyv ing through a wall of the casing. This shaft 1 has adjustments. f a hub 8 fixed thereon by means of a set'screw 9. rI 'lie clamp y33 comprises a plate 34 having av ,The yhub 8 has a threaded lsleeve portion Illgon: flat bottom surface 35 adapted 'to be moved 55vv along lthe top of the platform 25 by hand in l on the plate 32.

.grinding the shear blade. This plate 34 has a bevelled top surface 3B (see Fig. 2) that extends upwardly away from one side edge of the plate 34. A spring clamping plate 31 is loosely pivoted upon a reduced portion 38 of a pin 39 mounted The opening in the plate 31 that receives the pin 38 is somewhat larger than the pin so asr to permit free play of the plate 3l thereon. 'At the edge opposite the pin 39, the plate 3l is bent downwardly to providea clamping portion 4Q that overlies the bevelled surface 36 of the p-late 3ft. Theangle of the portiong e with respect to the body portion of the plate '3K1 is somewhat greater than the angle of the bevelled surface y35 with the plane of the rilate-l.`

' A clamping screw 6i 'has a reduced threaded'portion t2 threaded into an opening 43 in the plate Sli and is enlarged above the threaded portion A2 so as to press down upon the plate 31 which is. apertured to receive the threaded portion 42.I A knurledhead M is provided on the clamping screw 4l. The angular portion 4310i the' plate 3l' is cut out as' indicated at 44 so as to provide spacedclamping fingers i5 and 46.

The manner in which a blade 4l of a pair of shears is clamped between the bevelled surface v 355 and the fingers 42,5 and 46 is, believed to be evident. YThe blade loan thus be held at the same angle everytime vit is desired to sharpen it, and, since the position of the cutting edge of the blade .is such that it extends over the adjacent edge of the plate 3 so as to contact the grinding wheel I l, successive grindings of the bladexlil may always be made at the same angle. The platforrni enables the operator to set the edgeI of the blade in aline which lies. in the plane including the top of the platform 25 and the' axis of the grinding wheel. The angle which is given. te the Cutting edge therefore will be the angle of the line tangent to the grinding Wheel at the pointV of contact to the `cutting edge of This conserves thev 'I'he ends of the plates 34 and 3l' Aare bevelled asshown at k148 so that the 'blade of the shears that is'not being sharpened can be held back out of the way of Therefore, it is not necessary'to the grinder. take the shears apart in order to sharpen the blades. v

The actual angle at the cutting edge` will, however, remain substantially unchanged for v'it issubstantially the angle of a line tangent to the grinder at the .cutting edge.

From the above description, it is believed that'.

the construction and advantages of this device will be readily apparent to those skilled in this art. y y

Having thus described one specific formof my invention, what `vI claim as new and desire to 1 secure. by Letters Patent is:

1.' A` grinding machine of the character described comprising a grinding wheel, a drive shaft therefor, a motor for driving said shaft, a housing and supporting framework in Awhich Asaid Ino-v tor isV mounted, said shaft projecting through said framework and said 'grinding wheel being moimted on ythe shaft outside the framework, saidr framework includinga pair of side plate members, and a cover plate, said' side plate members having, portions .projecting beyondy the cover y plate at one sidethereof, andv awork guiding platform mounted on said portions, one of said` side plate members having a shelf portion extendins loatwar.dlr awa-y; fromthofromowork and looliootlo.goadlsrindingWheel..

2-A grindingmaohioe ofthe `ollalrootor doscribed having a grin-ding wheel, a. drive` shaft therefor, moons for rototinezsaid shaft. a clamp having o plato nrovidodwith o flotqeuidoswfy face. oniliobottola thereof and. o bovelled upper Surface extending. angolari-y yiliowofrd:from one oase-.of the mais', Seid olorophovioeinoons to I.

jao n.

`@Laglio a ,sboarbloooto said bovollod ,surface with the cutting edge thereof projectingover theadiaoelot ods@ the piloto. o 'Supporting framework having a Shelf borlooth Saidv Whootand a guide e platform for Y.Saiol plate on which the plotomoy..l

oe- ,movedv` toward and away irom tho Wheel ,in -o directionsubstantially perpendicular tothe pe, riphery thereof, said framework including side pla-io members ertonoinebeneoth thoolotform and. having flanges for mounting said platform spaced-relation to the grinding Wheel.

3- Afgrodioamoohiooof the ohorootordoscribed-having afgrinding wheel, a drive shaftv therefor. moons for rotating said shame clampl f having a plate provided-with a fiat guide surface A' '45 face eXtendingaQgu'aNy'upward from one edge` l on the bottom thereof and a bevejlled 11131381' suror the plots, said olomrahavine'moaos to `clamp a `shear bladel to "said bevelled rsurface with the cutting ooge' thoreofioroiooting over the' odion centeclge Aof the plate, and a guideplatforirrfor saidplat'e on which the plate may be moved to-` wardand away from the 4wheel in a direction sub. stantiallyperpendicular to the peripherythereof,

said, platform comprisinga Slat elongated plate mounted horizontallyin wheele,

LEQJJWAHL.

front of the: grindingv 

